a series of point coordinates are known, and their orientation (angle). Calculate gradient

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ZhG
ZhG 2013-9-27
评论： ZhG 2013-9-27
For example, 10 points' coordinates are known, as (xi, yi) i =1 ... 10 and a corresponding angle of each point is known, as ai
How I can calculate the gradient of each point and How does it show an arrow on the image for each point?
Thanks.

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回答（1 个）

Image Analyst
Image Analyst 2013-9-27
How can a bunch of points in a 2D plane, scattered all over the place, have a gradient? How did you get the angle at those points, but not the magnitude ?
Anyway, you can use quiver to put arrows on the picture.

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